"Ron Baker" <[EMAIL PROTECTED]> made an utterance to the drakelist gang ---------------------------------------------------------------------- Hello Paul, to answer your question on substitute tubes, there are no substitutes for the 6JB6 tube. I know there are several like the 6KM6 and I could identify several more, but none of them will substitute. The reason being those tubes have different interelectrode capacitance. I have experimented with several of these substitute tubes and found because of the difference in capacity the tuning is different and sometimes very strange. I found all of them will work fine on 80 and 40 meters, you get into trouble on the higher bands. All of then tend to oscillate, neutralization is impossible and if it does it drifts around. Some of the substitutes will run a lot more power on 80 and 40, again not work on the high bands, but on 80 and 40 while running more power they burn up the other transmitter components.
The bottom line is there are no real substitutes for the 6JB6. I know its bummer but going down the substitute path will eventually cause problems. Here is a link to my drake website, here I have an article where I tested some of these substitutes. http://www.wb4hfn.com/DRAKE/DrakeArticles/Final_Tubes.htm 73, Ron / WB4HFN -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Paul Sent: Sunday, February 12, 2006 12:05 AM To: drakelist@www.zerobeat.net Subject: [drakelist] 6JB6 substitutes I see where 6JB6's can be substituted with 6KM6 sweep tubes.Has anyone tried these? Are they a good sustitue or not? Do they physically fit in the RF cage? Tnx & 73 AD3G ---------------------------------------------------------------------- Submissions: drakelist@www.zerobeat.net Unsubscribe: [EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost: [EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net ----------------------------------------------------------------------
